package com.example.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.example.reggie.common.BaseContext;
import com.example.reggie.common.R;
import com.fasterxml.jackson.databind.ser.Serializers;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;



@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取请求URL
        String requestURL = request.getRequestURI();

        //规定无需拦截的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"

        };

        //判断本次请求是否需要处理
        boolean check = Check(requestURL,urls);

        //放行
       if( check){
           log.info("本次请求不需要处理{}",requestURL);
           filterChain.doFilter(servletRequest,servletResponse);
           return;
       }

        //判断管理端登录状态
        if(request.getSession().getAttribute("employee") != null){
            Long empId = (Long)request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }

        //判断移动端是否登录
        if(request.getSession().getAttribute("user") != null){
            Long userId = (Long)request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }

        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

        log.info("Filter生效,拦截到:" + request.getRequestURI());


    }

    public boolean Check(String requestURL,String[] urls){
        for(String url:urls){
            boolean match = PATH_MATCHER.match(url,requestURL);
            if(match)
                return true;
        }
        return false;
    }

}
